Staurotheca
publication ID |
https://doi.org/ 10.11646/zootaxa.4293.1.1 |
publication LSID |
lsid:zoobank.org:pub:6FF96B5C-1F80-47ED-9962-19603DCBF550 |
DOI |
https://doi.org/10.5281/zenodo.4386836 |
persistent identifier |
https://treatment.plazi.org/id/C84B87CA-CC35-FF96-E8DD-00DF0A6EF15C |
treatment provided by |
Plazi |
scientific name |
Staurotheca |
status |
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Staurotheca sp.
( Fig. 11 View FIGURE 11 F–I)
Material examined. Stn 53, palmate colony 85 mm high, basibiont of Hebella plana , and colony fragment 22 mm long (NIWA 117545); Stn 67, one colony 45 mm high (MNCN 2.03/617).
Description. Colonies palmate, up to 85 mm high and basally polysiphonic, with closely-knit mesh appearance due to frequent branching and anastomoses.
Hydrothecae arranged in decussate verticils of three, resulting in six longitudinal rows of hydrothecae; few basal branches with decussate pairs. Hydrotheca ( Fig. 11 View FIGURE 11 F–I) immersed into branch in about half, or even less, of its volume. Adcauline hydrothecal wall with significant free portion ( Fig. 11 View FIGURE 11 G). Abcauline wall straight or slightly convex basally, but concave distally ( Fig. 11 View FIGURE 11 G, I). Hydrotheca cylindrical in lateral view ( Fig. 11 View FIGURE 11 I), directed outwards at distal part. Hydrothecal aperture circular, directed downwards. Hydrotheca with mushroom-shaped diaphragm.
Measurements (in µm). Hydrothecae: abcauline wall 600–620, free part of adcauline wall 30–120, adnate part of adcauline wall 750, adcauline wall 690–780, diameter at aperture 210–220, maximum diameter ca. 320, diameter at diaphragm ca. 280. Cnidome: larger microbasic mastigophores 20–21 x 4.5, smaller microbasic mastigophores 9 x 3.
Remarks. The material studied is morphologically close to S. glomulosa by the general shape and size of the hydrotheca. However, they differ because the hydrothecae are arranged in decussate pairs in S. glomulosa . It also differs from S. dichotoma by the distinctly smaller diameter of the hydrotheca (e.g., the diameter of the hydrothecal aperture is 273–332 µm in S. dichotoma , cf. Peña Cantero et al. 1997a). It could be conspecific with the species described as Dictyocladium fuscum by Hickson & Gravely (1907), with which it agrees in the general shape and size of the hydrotheca and in the presence of decussate verticils of three hydrothecae. However, it would be necessary to examine the type material of that species before reaching a conclusion.
Ecology and distribution. The material was collected at depths between 197 and 286 m, off Cape Hallett.
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.
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